The Multilin™ 345 is a member of the Multilin 3 Series protective relay platform and has been designed for the protection, control and management of power transformers as primary or backup protection device. The 345 provides advanced transformer protection, control and monitoring in one economical draw-out or non draw-out design. The 345 contains a full range of self-contained protection and control elements as well as advanced communications, metering, monitoring and diagnostics.

The 345 transformer protection system is designed to protect and control small to medium size power transformers. Flexible and powerful, the 345 provides advanced transformer protection, control and monitoring in one economical draw-out design. The 345 contains a full range of self-contained protection and control elements as detailed in the Functional Block Diagram and in the Features table. The 345 can be even used for dual feeder protection.

Key Features

Comprehensive metering

Event Recorder: 256 events (1ms time stamping)

Programmable oscillography up to 32 samples per cycle and digital states and Fault Report

4X20 character LCD display

Control panel with 12 LED indicators

Relay health diagnostics and Breaker monitoring

Security and password control

SNTP or IRIG-B time synchronization

Power System Troubleshooting

Analyze power system disturbances with transient fault recorder and event records

Metering, Monitoring & Diagnostics

The 345 continuously measures and computes the following AC signals indicating the health of the protected transformer:

Phase winding currents

Winding ground current

Winding neutral current

Winding negative sequence current

Differential and restraint currents per-phase

Winding ground differential current

Percent 2nd and 5th harmonics differential currents per phase

Percent thermal capacity per-phase

Current demand

The states of all digital inputs/outputs are provided through the actual values either from the summary pages or individually. This includes:

The 345 utilizes the most advanced communication technologies today making it the easiest and most flexible transformer protection relay to use and integrate into new and existing infrastructures. Multiple communication ports and protocols allow control and easy access to information from the 345. The 345 supports the most popular industry standard protocols enabling easy, direct integration into electrical SCADA and HMI systems. Modbus RTU is provided as standard with a RS485 networking port.
The following optional protocols are available:

IEC 61850

IEC 61850 GOOSE

DNP 3.0

Modbus RTU

Modbus TCP/IP

IEC 60870-5-103

IEC 60870-5-104

These protocols make it easy to connect to a Utility or Industrial automation system, eliminating the need for external protocol converter devices.

EnerVista™ Software

The EnerVista™ suite is an industry leading set of software programs that simplifies every aspect of using the 345 relay. The EnerVista™ suite provides all the tools to monitor the status of the protected asset, maintain the relay, and integrate the information measured into DCS or SCADA monitoring systems. Convenient COMTRADE and sequence of event viewers are an integral part of the 345 setup software and are included to ensure proper protection and system operation. Learn More

Feeder protection settings in one easy step

Access Control

Multilin devices and relays are designed with simple but powerful security to enable reliability and compliance for virtually any project or implementation. Password security is an optional feature of the 3 Series which can be setup using the SR3 EnerVista Setup software. The password system has been designed to facilitate a hierarchy for centralized management. This is accomplished through a Master level access password which can be used for resetting lower level access passwords and higher level privileged operations.

Auditing and Reporting

With the Security Audit Trail reporting feature, available in GE’s ViewPoint Monitoring software, operators are able to obtain Event logging reports of key activities such as configuration changes. These pre-formatted reports can be used to help ensure device and protection system integrity and perform forensic auditing of activities and changes for compliance.

Trace any setting changes with security audit trail.

Key Features

4 line display for easy viewing of key data

12/10 LED indicators for quick diagnostics

Programmable LED indicators for specific targets

Draw out or non draw out design options

Hardware

Inputs and Outputs

The 345 features the following inputs and outputs for monitoring and control of typical transformer applications:

10 contact Inputs with programmable thresholds

2 Form A outputs for breaker trip and close with coil monitoring and 5 Form C output relays

Drawout & Non-Drawout Construction

The 345 is offered in both a drawout or a nondrawout construction. In the drawout case design the 345 simplifies installation and improves site safety as the need to open switchgear doors or rewire the device after testing is eliminated.

The 345 protection relay chassis used with a draw out relay is available separately, for use as a partial replacement or in test environments. The draw out relay with no chassis is also available to order as a spare unit.

About Grid SolutionsGE's Grid Solutions business serves customers globally with over 19,000 employees in approximately
80 countries. Grid Solutions helps enable utilities and industry to effectively manage electricity from the point of generation to
the point of consumption, helping to maximize the reliability, efficiency and resiliency of the grid.